v3.22.0.1
Stockholders’ Equity (Deficit) (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Fair Value Assumptions of Options Granted
The fair value of each stock option award is estimated on the date of grant using the Black-Scholes option-pricing model using the range of assumptions in the following table:

Year Ended December 31,
201920202021
Expected dividend yield— — — 
Volatility
41.8% - 44.3%
39.1% - 43.6%
44.2% - 44.9%
Expected term (years)
5.0 - 8.0
5.1 - 8.0
8.0
Risk-free interest rate
1.5% - 2.5%
0.5% - 1.5%
1.1% - 1.5%
Summary of Option Activity
A summary of option and RSU activity under the Plans was as follows (in thousands, except per share amounts):

Outstanding
Stock Options
Outstanding
Restricted Stock Units
 Shares
Available for
Grant		Number of
Shares		Weighted-
Average
Exercise
Price		Number of
Shares		Weighted-
Average
Grant
Date Fair
Value
Balances as of December 31, 201925,344 46,512 $10.08 76,136 $45.69 
Granted(1)
(45,368)4,638 39.38 40,730 30.13 
Increase in shares available for grant(2)
66,942 — — — — 
Shares withheld for taxes24,296 — — — — 
Exercised/Vested — (7,496)2.01 (56,070)37.79 
Canceled(3)
15,206 (2,233)53.32 (13,042)51.86 
Balances as of December 31, 202086,420 41,421 12.48 47,754 40.01 
Granted(1)
(9,591)715 191.08 8,876 181.15 
Shares withheld for taxes464 — — (464)66.99 
Exercised/Vested— (17,707)7.77 (15,612)57.05 
Canceled(3)
4,072 (307)56.69 (3,765)64.32 
Balances as of December 31, 202181,365 24,122 19.69 36,789 61.22 
(1) There were no options or RSUs that were granted from the Assumed Equity Incentive Plan for the years ended December 31, 2020 and 2021.
(2) Includes 62,069,613 shares of the Company’s Class A common stock initially reserved for issuance under the 2020 Incentive Award Plan.
(3) The outstanding options and RSUs include cancellations of 55,158 and 2,158 options and 14,178 and 530 RSUs in 2020 and 2021, respectively, from the Assumed Equity Incentive Plan that are no longer available for future grants.
 Number of
Shares (in
thousands)		Weighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Life (years)		Aggregate
Intrinsic
Value
Options outstanding as of December 31, 202041,421 $12.48 3.91$5,563,735 
Options exercisable as of December 31, 202036,682 8.63 3.215,068,315 
Options outstanding as of December 31, 202124,122 19.69 3.663,555,384 
Options exercisable as of December 31, 202120,909 13.28 2.903,206,548 
Summary of RSU Activity
A summary of option and RSU activity under the Plans was as follows (in thousands, except per share amounts):

Outstanding
Stock Options
Outstanding
Restricted Stock Units
 Shares
Available for
Grant		Number of
Shares		Weighted-
Average
Exercise
Price		Number of
Shares		Weighted-
Average
Grant
Date Fair
Value
Balances as of December 31, 201925,344 46,512 $10.08 76,136 $45.69 
Granted(1)
(45,368)4,638 39.38 40,730 30.13 
Increase in shares available for grant(2)
66,942 — — — — 
Shares withheld for taxes24,296 — — — — 
Exercised/Vested — (7,496)2.01 (56,070)37.79 
Canceled(3)
15,206 (2,233)53.32 (13,042)51.86 
Balances as of December 31, 202086,420 41,421 12.48 47,754 40.01 
Granted(1)
(9,591)715 191.08 8,876 181.15 
Shares withheld for taxes464 — — (464)66.99 
Exercised/Vested— (17,707)7.77 (15,612)57.05 
Canceled(3)
4,072 (307)56.69 (3,765)64.32 
Balances as of December 31, 202181,365 24,122 19.69 36,789 61.22 
(1) There were no options or RSUs that were granted from the Assumed Equity Incentive Plan for the years ended December 31, 2020 and 2021.
(2) Includes 62,069,613 shares of the Company’s Class A common stock initially reserved for issuance under the 2020 Incentive Award Plan.
(3) The outstanding options and RSUs include cancellations of 55,158 and 2,158 options and 14,178 and 530 RSUs in 2020 and 2021, respectively, from the Assumed Equity Incentive Plan that are no longer available for future grants.
 Number of
Shares (in
thousands)		Weighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Life (years)		Aggregate
Intrinsic
Value
Options outstanding as of December 31, 202041,421 $12.48 3.91$5,563,735 
Options exercisable as of December 31, 202036,682 8.63 3.215,068,315 
Options outstanding as of December 31, 202124,122 19.69 3.663,555,384 
Options exercisable as of December 31, 202120,909 13.28 2.903,206,548 
The following table summarizes the activity related to the Company’s restricted common stock (in thousands, except for per share amounts):

Number of
Shares		Weighted-Average
Grant-Date 
Fair Value
Per Share
Unvested restricted common stock as of December 31, 2019996 $62.26 
Issued— — 
Vested(278)62.12 
Unvested restricted common stock as of December 31, 2020718 62.33 
Issued— — 
Vested(86)62.41 
Unvested restricted common stock as of December 31, 2021632 62.32 
Summary of Stock-based Compensation Expense
The following table summarizes total stock-based compensation expense (in thousands):

Year Ended December 31,
201920202021
Operations and support$817 $143,997 $48,473 
Product development56,632 1,878,793 545,113 
Sales and marketing23,919 435,272 99,969 
General and administrative16,179 544,086 205,292 
Restructuring charges— (200)(17)
Stock-based compensation expense$97,547 $3,001,948 $898,830